Bumping gaia.json for 2 gaia-central revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0964e9ebb851
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Merge pull request #12369 from KevinGrandon/bug_919591_contacts_defer_scripts

Bug 919591 - Defer contact scripts r=vingtetun,francisco

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https://hg.mozilla.org/integration/gaia-central/rev/013acf302f09
Author: Kevin Grandon <kevingrandon@yahoo.com>
Desc: Bug 919591 - Defer contact scripts